overfiring greenware cone 6?

updated fri 28 feb 97

Ivan McGill on sat 8 feb 97

In my original message I had put bisqueware instead of greenware, sorry!!!

I'm glaze firing to cone 6 OX. What should I be firing my greenware to? I
am using M340 Plainsman Clay. Can you over fire greenware?

Lise in Sunny Prince George, B.C.

Tony Hansen on sun 9 feb 97

> I'm glaze firing to cone 6 OX. What should I be firing my greenware to? I
> am using M340 Plainsman Clay. Can you over fire greenware?

Bone china is bisque fired at cone 12.
Find a compromise between firing as high, as slow, with as much draft and
oxidation as possible with what is practical and easy to glaze. If you bisque
too high your glaze may not stick as well as you would like. But you can
alter your glaze slurry to make it stick better also.

Michelle Campbell on tue 11 feb 97

I use Plainsman M340, and bisque fire to ^06, glaze fire to ^6, with a ^7
sitter cone.

When I first started using this clay, I bisqued to ^010 (as was the club's
policy where I was learning), had problems with lots of pinholing and
pitting. Read somewhere that there might be too much organics left in the
bisque, starting firing higher and solved most of the problems (for the
whole club!)